Help me to place my lift correctly...

[ckkrause]

So my concrete contractor did a nice job in replacing my very cracked and uneven garage floor with a new slab:

12" x 12" rebar and drilled and epoxied rebar to current foundation... They did about 5 inches thick across the board and a 4' x 12' section in the middle 12" deep and with an additional layer of rebar. The slab turned out great except they put a 1/2" or so deep channel right in the middle of the 4' x 12' section of the slab as shown here:

(The cardboard represents the base plate and post of the lift I've purchased.)

My question is whether I can anchor the lift across that channel or whether I have to keep anchors 6" or so inches away as if it were a joint... If I have to avoid the channel, I would place it where shown in the pic and it would end up being on the edge of the 12" deep portion of the slab...

Could I get your thoughts on my dilemma?

Thanks for your response!

-Chuck

 

[Slowgsr]

I'd bolt it on the channel - it's just a control joint for when the slab contracts. It's full of rebar so there won't be any movement anyways.

I did the same type of repair in my garage on a portion of the floor that was broken in several spots. Back breaking work!

 

[ckkrause]

Thanks for your feedback... Although I don't really understand the purpose of a "control joint"

-Chuck

 

[overkill 19]

Also talk to your concrete guy. I think it's 30 day min of curing time before installing anchors

 

[estocean]

Thanks for your feedback... Although I don't really understand the purpose of a "control joint"

-Chuck

As the concrete cures it shrinks and cracks. The control joint "controls" where that crack occurs by providing a less thick, and thus weaker, slab at that location. If you could see the end of a slab you'd likely see where the crack starts at the control joint and progresses to the bottom of the slab. Better than a random crack out in the middle of the slab.
As for an anchor drilled into a joint, I'd avoid it if there was going to be an upward/pulling force at that location.

Sent from my SM-P900 using Tapatalk

 

[ckkrause]

Thanks for your comments! Now that I've found more threads about not anchoring a 2 post lift near joints, cracks, etc... I'll keep the anchors at 6 inches from any of these..

-Chuck